Truss.



No. 674,645. Patented May 2|, 19m.

H. C. DEMAREE &. W. C. ECKHAHT.

TBUSS.

(Application filed May 23, 1900.) (N o M 0 del.)

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UNITED STATES PATENT HENRY O. DEMAREE AND WILLIAM CHAS. ECKHART, OF ROCA, NEBRASKA;

TRUSS.

SPECIFIGATION forming part of Letters Patent N 0. 674,645, dated May 21, 1901.

Application filed May 231 1900. Serial No. 17,714. (No model.)

cure a yielding bearing between the pad and the belt of the truss of such character that the degree of resistance may be varied without taking the device apart, as fully set forth hereinafter and as illustrated in the accom- I 5 panying drawings, in which Figure 1 is a vertical section through the pad of the truss, showing our improvement. Fig. 2 is a plan View, and Fig. 3 is a vertical section through the adjusting-tube and plug of the device.

The pad A may be of wood, rubber, or other suitable material or combination of materials and is recessed to receive the parts hereinafter described,and the attachment Bis adapt- 2 5 ed for connection to a truss-band of any suitable character-as,for instance,what isknown as the Miller truss-bandand from the attachment B a rod a extends through a covering-plate b, extending over the recess in the 0 pad,and bears, by means of a cross-pin c,up0n

a spring d, which thus tends to force the rod Ct outward, and thereby constitutes a yielding ,bearing between the pad and the attachment.

It is desirable to vary under difierent'cir- 3 5 cumstances the yielding character of the bearing between the pad and the attachment and to effect this without the necessity of changing the spring or taking the device apart, and to secure this result we provide means where- 40 by the tension of the spring may be altered by means outside of the pad. Different means may be employed for this purpose; but, as shown, the spring 01 rests upon a cross-pin e at the lower end, and this cross-pin e may be moved upward or downward in the recess in the pad, so as to compress the spring cl to a greater or less extent, as required. The adjustment of the cross-pin e, which extends into vertical grooves in the sides of said recess, is efiected by means of a rotating tube f, having internal threads adapted to threads upon a block g, perforated for the passage of the pin e, so that by turning the tube f the block 9 is raised or lowered, the said block being prevented from turning by the ends of the pin 6 extending into the grooves m.

The tube f may be supported in any suitable manner. As shown, it has at the upper end a flange 7;, bearing against the underside of 'the plate I), and into the upper end of the tube extends a nipple 0, having a flange h, which bears upon the upper side of the plate I), the said nipple being brazed or otherwise permanently connected with the tube f. By this arrangement the two tubes can be turned together, while the flanges prevent any ver-' tical movement independent of the plate I).

In order that the cross-pin 0 may bear upon the spring 11, which incloses the tube f, the latter and the nipple are provided with vertical slots y. Any suitable means may be employed to facilitate the turning of the tube f. As shown, the flange h of the nipple O is angular, so that a wrench may be applied to the same to turn it readily, and to prevent the tube from turning when the device is in use a forked dog E, which receives the flange it between the forks, is bolted to the top of the plate I) by means of a screw or bolt 3, which also constitutes one of the screws for connecting the plate B to the pad. By'loosening the screw 5 the dog E may be carried out of position to permit the tubefto be turned, and

this may be effected by turning the pad itself, the connection of the stem 0. with the belt preventing the tube f from turning, so that the tension of the spring may be increased or decreased.

Without limiting ourselves to the precise construction and arrangement of parts shown, we claim as our inventionl. The combination of the recessed pad A,

having a plate covering the recess, a spring through said slots and a threaded block adapted to the lower end of the tube and a crosspin e, substantially as set forth.

4:. The combination with the recessed pad, covering-plate, rod, spring, a lower bearing for the spring and a tube for adjusting said bearing provided with a flanged nipple, of a 15 dog E for engaging the flange of the nipple,.

I and means for securing the dog detachably to the covering-plate, substantially as set forth.

In testimony whereof we have signed our names to this specification in the presence of 20 two subscribing witnesses.

HENRY O. DEMAREE. \VM. CHAS. EOKHART.

Witnesses:

W. B. MORRISON, JOHN J. STEIN. 

